160 строки
3.6 KiB
C
160 строки
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Driver for Samsung Q10 and related laptops: controls the backlight
|
|
*
|
|
* Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/backlight.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#define SAMSUNGQ10_BL_MAX_INTENSITY 7
|
|
|
|
static acpi_handle ec_handle;
|
|
|
|
static bool force;
|
|
module_param(force, bool, 0);
|
|
MODULE_PARM_DESC(force,
|
|
"Disable the DMI check and force the driver to be loaded");
|
|
|
|
static int samsungq10_bl_set_intensity(struct backlight_device *bd)
|
|
{
|
|
|
|
acpi_status status;
|
|
int i;
|
|
|
|
for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
|
|
status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
return -EIO;
|
|
}
|
|
for (i = 0; i < bd->props.brightness; i++) {
|
|
status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct backlight_ops samsungq10_bl_ops = {
|
|
.update_status = samsungq10_bl_set_intensity,
|
|
};
|
|
|
|
static int samsungq10_probe(struct platform_device *pdev)
|
|
{
|
|
|
|
struct backlight_properties props;
|
|
struct backlight_device *bd;
|
|
|
|
memset(&props, 0, sizeof(struct backlight_properties));
|
|
props.type = BACKLIGHT_PLATFORM;
|
|
props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
|
|
bd = backlight_device_register("samsung", &pdev->dev, NULL,
|
|
&samsungq10_bl_ops, &props);
|
|
if (IS_ERR(bd))
|
|
return PTR_ERR(bd);
|
|
|
|
platform_set_drvdata(pdev, bd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int samsungq10_remove(struct platform_device *pdev)
|
|
{
|
|
|
|
struct backlight_device *bd = platform_get_drvdata(pdev);
|
|
|
|
backlight_device_unregister(bd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver samsungq10_driver = {
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
},
|
|
.probe = samsungq10_probe,
|
|
.remove = samsungq10_remove,
|
|
};
|
|
|
|
static struct platform_device *samsungq10_device;
|
|
|
|
static int __init dmi_check_callback(const struct dmi_system_id *id)
|
|
{
|
|
printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
|
|
return 1;
|
|
}
|
|
|
|
static const struct dmi_system_id samsungq10_dmi_table[] __initconst = {
|
|
{
|
|
.ident = "Samsung Q10",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
|
|
},
|
|
.callback = dmi_check_callback,
|
|
},
|
|
{
|
|
.ident = "Samsung Q20",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
|
|
},
|
|
.callback = dmi_check_callback,
|
|
},
|
|
{
|
|
.ident = "Samsung Q25",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
|
|
},
|
|
.callback = dmi_check_callback,
|
|
},
|
|
{
|
|
.ident = "Dell Latitude X200",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
|
|
},
|
|
.callback = dmi_check_callback,
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
|
|
|
|
static int __init samsungq10_init(void)
|
|
{
|
|
if (!force && !dmi_check_system(samsungq10_dmi_table))
|
|
return -ENODEV;
|
|
|
|
ec_handle = ec_get_handle();
|
|
|
|
if (!ec_handle)
|
|
return -ENODEV;
|
|
|
|
samsungq10_device = platform_create_bundle(&samsungq10_driver,
|
|
samsungq10_probe,
|
|
NULL, 0, NULL, 0);
|
|
|
|
return PTR_ERR_OR_ZERO(samsungq10_device);
|
|
}
|
|
|
|
static void __exit samsungq10_exit(void)
|
|
{
|
|
platform_device_unregister(samsungq10_device);
|
|
platform_driver_unregister(&samsungq10_driver);
|
|
}
|
|
|
|
module_init(samsungq10_init);
|
|
module_exit(samsungq10_exit);
|
|
|
|
MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
|
|
MODULE_DESCRIPTION("Samsung Q10 Driver");
|
|
MODULE_LICENSE("GPL");
|